Only use Ivory, Lever 2000 original, or Fels Naptha only. If you use other soap that has oils in them they will stain your clothes. For an American size washer 1/4 cup. For a Germany size 1 to 2 tablespoons. For those stinky uniforms coming back from the field, I soak my husband’s uniform in the tub with 1/4 cup with some hot water then washed. The uniform come out clean and smelling wonderful… If you have a homemade cleaning product you would like to share please do. Just make a video and send it over. I will up load it and share it all the other families out there trying to save money and helping the environment at the same time.